TITLE:
Fault Tree Reliability Analysis for Passive Medium Pressure Safety Injection System in Nuclear Power Plant
AUTHORS:
Lengshan Leng, Yun Liu
KEYWORDS:
Passive Safety System; MP-SIS; FTA; Unavailability; MCS
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
October
15,
2013
ABSTRACT: Modern nuclear power plants, both newly designed generation 3 and existing generation 2 reactors, make use of passive safety systems for significant and measurable improvements in safety and reliability. Medium Pressure Safety Injection System (MP-SIS) in Tianwan Nuclear Power Plant is a typical and very important nuclear safety passive system. This paper discusses the reliability of MP-SIS on the basis of Fault Tree Analysis (FTA) with unavailability and Minimal Cut Set (MCS) calculated as two important indicators. The result illustrates that the passive MP-Safety Injection Tank barely contributes to the system’s unavailability and human interactions with Manual Valves and Motor Operated Valves have great negative impact on the reliability.